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2Alex_R: Thanks for the comment.
I really don't understand how I managed to lose. I just thought I was winning no matter what: log + amulet + boots + wings - against the opponent's log.
I managed to mess up for 2 days, even until the last battle, underestimating the strength of his army. Of course, I should have focused on magic, I knew about the shackles. The first turn didn't decide anything here. I still cast antimagic and destroyed everyone with Arcomage (I couldn't do it right away because his dragons survived).
And also, the thing was that I didn't know if he had a Cloak of Disruption. If he did, I would have lost that battle. And there was also no hero with wisdom nearby. But still, I should have realized that he was stronger in melee combat, and risked attacking with magic, or not risked and retreated, taken Utopia, the Ring of the Elements, and bought back the remaining troops. Then I would have had a big advantage in demons.
In general, I'm still learning to play.
P.S. And also, respect to Andrey for pulling off an almost hopeless game, even if with my help.